//
// (C) Copyright 2009 Irantha Suwandarathna (irantha@gmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


using System;
using System.Text;
using EffiProz.Core.Errors;


namespace EffiProz.Core.RowIO
{

    /**
     * Fields _in the source file need not be quoted. Methods _in this class unquote
     * the fields if they are quoted and handle quote character doubling _in this
     * case.
     *
     * @author sqlbob@users (RMP)
     * @version 1.7.2
     * @since 1.7.0
     */
    public class RowInputTextQuoted : RowInputText
    {
        private const int NORMAL_FIELD = 0;
        private const int NEED_END_QUOTE = 1;
        private const int FOUND_QUOTE = 2;
        private char[] qtext;

        public RowInputTextQuoted(String fieldSep, String varSep,
                                  String longvarSep, bool allQuoted)
            : base(fieldSep, varSep, longvarSep, allQuoted)
        {

        }

        public override void setSource(String text, int pos, int byteSize)
        {

            base.setSource(text, pos, byteSize);

            qtext = text.ToCharArray();
        }

        protected override String getField(String sep, int sepLen,
                                  bool isEnd)
        {

            //fredt - now the only supported behaviour is emptyIsNull
            String s = null;

            if (next >= qtext.Length || qtext[next] != '\"')
            {
                return base.getField(sep, sepLen, isEnd);
            }

            try
            {
                field++;

                StringBuilder sb = new StringBuilder();
                bool done = false;
                int state = NORMAL_FIELD;
                int end = -1;

                if (!isEnd)
                {
                    end = text.IndexOf(sep, next);
                }

                for (; next < qtext.Length; next++)
                {
                    switch (state)
                    {

                        case NORMAL_FIELD:
                        default:
                            if (next == end)
                            {
                                next += sepLen;
                                done = true;
                            }
                            else if (qtext[next] == '\"')
                            {

                                //-- Beginning of field
                                state = NEED_END_QUOTE;
                            }
                            else
                            {
                                sb.Append(qtext[next]);
                            }
                            break;

                        case NEED_END_QUOTE:
                            if (qtext[next] == '\"')
                            {
                                state = FOUND_QUOTE;
                            }
                            else
                            {
                                sb.Append(qtext[next]);
                            }
                            break;

                        case FOUND_QUOTE:
                            if (qtext[next] == '\"')
                            {

                                //-- Escaped quote
                                sb.Append(qtext[next]);

                                state = NEED_END_QUOTE;
                            }
                            else
                            {
                                next += sepLen - 1;
                                state = NORMAL_FIELD;

                                if (!isEnd)
                                {
                                    next++;

                                    done = true;
                                }
                            }
                            break;
                    }

                    if (done)
                    {
                        break;
                    }
                }

                s = sb.ToString();
            }
            catch (Exception e)
            {
                throw new System.IO.IOException(
                    Error.getMessage(
                        ErrorCode.M_TEXT_SOURCE_FIELD_ERROR, 0, new Object[] {
                field, e.ToString()
            }));
            }

            return s;
        }
    }
}
